An investigation by Polk County detectives and the Iowa Division of Criminal Investigation is ongoing.

An investigation by Polk County detectives and the Iowa Division of Criminal Investigation is ongoing.

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Updated: 10:08 PM CDT Aug 15, 2016

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WEBVTT Shock filled this Grimes neighborhood on July 22nd - as authorities worked to piece together what killed two year old Mason Wyckoff and his mother Stephenie Erickson. <THIS IS WHAT WE WERE WAITING FOR WAS THE RESULTS OF THE TOXICOLOGY FOR BOTH MASON AND STEPHENIE AND IT ANSWERED A LOT OF QUESTIONS.> Officials now tell us they can definitively say it's oxycodone that killed the Erickson and her toddler son. <THE AUTOPSY HAS ABVIOUSLY TOLD A STORY THAT THIS WAS A HOMICIDE ON MASON AND SUICIDE ON STEPHANIE> Officials won't comment on the amount of drugs in their systems, or on exactly what happened that day ... But Wyckoff's death certificate says he died just after 10am that Friday. <"HE WAS MY EVERYTHING, HE WAS MY WHOLE LIFE."> Mason's father, Dillon Wyckoff spoke out right after his son's death - saying this is the outcome he always feared. A 9-11 call from last September revealed he was worried about his son's safety and believed Erickson was unstable. <SHE IS THREATENING TO TAKE MASON AND SAYING I'LL NEVER SEE HER AGAIN AND SHE'S THREATENING TO TAKE HER OWN LIFE. IT'S STARTING TO GET REALLY SERIOUS.> Erickson's family has declined to comment publicly. Authorities say they're working with them to give them all the answers they need. <THIS IS MOST CERTAINLY A SAD ENDING. OUR HEARTS GO OUT TO THE FAMILY OF

Grimes mother's cause of death released

An investigation by Polk County detectives and the Iowa Division of Criminal Investigation is ongoing.